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Old 04-27-2011, 12:46 AM   #1
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Ignoring Broadcast traffic

Ok so our network has avaya phones all over the place and the DHCP server(separate from mine) is constantly broadcasting over UDP ports 67 and 68, so my NIC is showing a constant influx of connections averaging ~90KBps. Is there any way on my end I can ignore this traffic so I don't show that 90KBps, or am I SOL?
Old 04-27-2011, 01:03 AM   #2
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how about some thing like:
$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d --destination-port 67:68 -j DROP
Old 04-27-2011, 08:23 AM   #3
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Originally Posted by micxz View Post
how about some thing like:
$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d --destination-port 67:68 -j DROP
Since nothing jumps to udp_packets table, its probably simpler as follows (I'll put in the sudo command too):
sudo iptables -A INPUT -p UDP -i $INET_IFACE -d --destination-port 67:68 -j DROP
$INET_IFACE is your ip address.
Also be advised that many ip addresses can get used for broadcasting. I don't know what your Avaya traffic uses. So be prepared to replace the with that address too. Note also this will shut off ALL broadcasts, including those from printers coming online, misc other servers, lotsa things (anything that might be using You need to stay aware of that too.


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